The pack­age is an ex­ten­sion of the stan­dard
la­tex-graph­ics bun­dle and
pro­vides a way to in­clude re­peated PostScript graph­ics (ps, eps)
only once in a PostScript doc­u­ment. This leads to
smaller PostScript doc­u­ments when hav­ing, for in­stance, a logo
on ev­ery page. The pack­age only works when post-pro­cessed with
dvips, which should be
ver­sion 5.95b or later.

The dif­fer­ence for a re­sult­ing dis­tilled PDF file is
min­i­mal (as Ghostscript and Adobe Dis­tiller only in­clude a
sin­gle copy of each graph­ics file, any­way).